#include<stdio.h>
#include<stdlib.h>
int main()
{
   int x=1;
   int y=10;
   int i,j;
   int velocity=1;
   while(1)
   {
      system("cls");
	  if((x>10)||(x<1))
		  velocity=-1*velocity;
	  x=x+velocity;
   for(i=0;i<=x;i++)
      printf("\n");
   for(j=0;j<=y;j++)
       printf(" ");
	   printf("0\n");
   }
   return 0;
   }